Radiation imagery chemistry: process – composition – or product th – Radiation sensitive product – Identified radiation sensitive composition with color...
Reexamination Certificate
2000-09-27
2002-07-09
Letscher, Geraldine (Department: 1752)
Radiation imagery chemistry: process, composition, or product th
Radiation sensitive product
Identified radiation sensitive composition with color...
C430S510000, C430S517000, C430S522000, C430S631000, C430S634000, C430S531000
Reexamination Certificate
active
06416942
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a silver halide photographic light-sensitive material, in particular to a silver halide photographic light-sensitive material having a hydrophilic colloidal layer containing a compound that is able to improve stability of solid particle dispersion of fine particles comprising a water-insoluble photographically useful material.
BACKGROUND OF THE INVENTION
In the field of silver halide photography, various kinds of photographically useful compounds are incorporated in a hydrophilic colloidal layer, to thereby attain various kinds of photographic effects/functions. Photographic elements, such as a light-sensitive material and an image-receiving material, are constructed by using such a hydrophilic colloidal layer. As a method of introducing a photographically useful material into the hydrophilic colloidal layer, a solid particle dispersion method can be used in the case where the photographically useful material is insoluble in water. This is a method of preparing a dispersion, and the method comprises finely dispersing the material in the state of solid fine particles in water or a protective colloidal liquid, by, for example, a mill, to obtain a solid particle dispersion, and then adding the resultant solid particle dispersion to a coating solution. Hitherto, as a dispersant or dispersion aid, various kinds of surfactants are used. For example, as a low molecular weight surfactant, known surfactants and compounds described in, for example, JP-A-52-92716 (“JP-A” means unexamined published Japanese patent application) and International publication WO 88/04794 may be used. Further, as an anionic high molecular weight or nonionic high molecular weight surfactant, known compounds and synthetic polymers may also be used. For example, polymers described in JP-A-4-324858 can be used.
However, each of the surfactants for use in the conventional photographic elements is necessary to be properly selected in accordance with the purpose of use or an intended effect. Further, even though a surfactant is selectively used, the stability of a solution or dispersion of the photographically useful material is not sufficient. Consequently, sometimes deposition or aggregation of the dispersion occurs, and deposition or bleeding is caused during storage of a photographic element with the lapse of time. Further, considerably large amount of surfactant is sometimes necessary to be used in accordance with the purpose of use. As a result, adverse side effects occur, such as stickyness, deterioration of the stability of a raw photographic element (hereinafter referred to as “raw storability”), adhesion defect, defects due to diffusion of an additive through layers (color mixing, deterioration with the lapse of time, etc.), deterioration of coating characteristics, and the like.
Further, there is a demand that dispersion particles of a water-insoluble photographically useful material be rendered more finer particles, in order to make a more thinner layer and/or to improve reactivity. Moreover, even though an aqueous coating solution is applied thereon, it is sometimes necessary to render the surface of the layer hydrophobic, in order to give adhesion-resistance or to prevent adhesion of water onto the surface. Further, in order to achieve the above purposes, improvement of the water-insoluble photographically useful materials per se has been performed. JP-A-8-50345 for instance describes a dyestuff compound that gives no chemically adverse affect to a photographic emulsion, that is able to dye only a specific layer in the photographic light-sensitive material and does not diffuse to another layer, that is rapidly decolored and/or dissolved away from the layer at the time of development processing and consequently does not remain in the photographic light-sensitive material, and that has excellent absorption characteristics. However, it is difficult to say that the above-described dyestuff is totally satisfactory, from the overall view points.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a photographic element that allows a water-insoluble photographically useful material to be stably introduced into the photographic element for various uses and further that allows the material to quite stably exist in the photographic element, and furthermore that a surfactant having substantially no adverse effect is used therein. Further, another object of the present invention is to provide a photographic element using a macromolecule (dispersant) which enables to render a dispersion of a water-insoluble photographically useful material to more finer particles thereof.
Other and further objects, features, and advantages of the invention will appear more fully from the following description.
DETAILED DESCRIPTION OF THE INVENTION
The above objects were attained by the following means.
(1) A silver halide photographic light-sensitive material, comprising a support and provided thereon at least one light-sensitive silver halide emulsion layer and at least one hydrophilic colloidal layer comprising a solid particle dispersion of a water-insoluble photographically useful compound, said solid particle dispersion being a dispersion comprising both a water-insoluble photographically useful compound represented by formula 1 and a polymer represented by formula 2:
wherein, in formula 1, A represents an acidic nucleus; L
1
, L
2
and L
3
each represent a methine group which may be substituted; R
1
and R
3
each represent a hydrogen atom or a substituent (including an atom), R
2
represents a substituent (including an atom), n represents 0 or 1, m represents an integer of 0 to 4, and when m is an integer of 2 to 4, R
2
'S may be the same or different; and x represents an electron-withdrawing group having a Hammett's substitution constant &sgr;
m
of 0.3 to 1.5;
wherein, in formula 2, R
4
's each independently represent a hydrogen atom, or an alkyl group having 1 to 6 carbon atoms, R
5
represents a substituted or unsubstituted alkyl group having 2 to 18 carbon atoms, a substituted or unsubstituted aralkyl group having 7 to 12 carbon atoms, or a substituted or unsubstituted aryl group having 6 to 18 carbon atoms, L
4
represents a divalent linking group, x represents 0 or 1, M represents a monovalent cationic group, p represents 2 to 90% by weight, q represents 5 to 50% by weight, and r represents 0 to 50% by weight, with the proviso that p+q+r=100 (wt %).
(2) The silver halide photographic light-sensitive material according to the above (1), wherein said solid particle dispersion is a solid particle dispersion in which, after dispersing the water-insoluble photographically useful compound represented by formula 1, the polymer represented by formula 2 is added thereto.
(3) The silver halide photographic light-sensitive material according to the above (2), wherein said solid particle dispersion is a solid particle dispersion in which, after dispersing the water-insoluble photographically useful compound with a polymer represented by formula 3, the polymer represented by formula 2 is added thereto:
wherein K represents a divalent aliphatic linking group having 1 to 50 carbon atoms, M represents a monovalent cationic group, E represents a repeating unit derived from a copolymerizable ethylenically unsaturated monomer, u represents 5 to 100 mol %, and v represents 0 to 95 mol %.
The formula (2) or (3) by which the copolymers for use in the present invention are represented, shows each of constitutional units and constitutional ratio thereof, and these formulae should not be construed as being limiting a polymerization form of each of the constitutional units to a block copolymer, a random copolymer, and the like.
In formula 1, the compound to give the acidic nucleus group represented by A is preferably 5-pyrazolone, isooxazolone, barbituric acid, thiobartituric acid, pyrazolopyridone, rhodanine, hydantoine, thiohydantoine, oxazolidinedione, pyrazolidinedione, indanedione, hydroxypyridone, 1,2,3,4-tetrahydroquinoline
Nakanishi Masatoshi
Sasaki Hiroki
Birch & Stewart Kolasch & Birch, LLP
Fuji Photo Film Co. , Ltd.
Letscher Geraldine
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